Open-exhaust silencer.



C. F. M. GALAINE.

OPEN EXHAUST SILENCER.

APPLIOATION FILED JAN. 27, 1913.

1,076,494. Patented o@t.21,1913.

CONSTANT IABIE Gm, u' Bm, MCE.

`OPEN-EXHAUSI! SILENCER.

spammen-mamma Patented oct. 21A, 1913.

Application led January 27, 191'3. ySerial ll'o. 744,505.

provements in Open-Exhaust Silencers, of

which the following is a specification.

The resent invention relates to a device for a sllent and open exhaustof the gases of explosive engines.

The principle of the arrangement is as follows: The exhaust tube freelyopen at its end is provided for one part of its length with holes ornarrow openings. The exhaust gases are divided into two parts, one

which follows the exhaust tube and the other which traverses the openinConsequently the pressure adually fa ls in the exhaust tube and a geeexhaust is effected with the gradual stopping of the gases. l' Theeilicacy of the dev1ce is increased by arrangmg its parts in such a way-as to increase the proportion of the gases which traverse the openings.

The annexed drawing shows by way of example various methods of carryingout the object of the invention.

` Figure 1 is a longitudinal section of a free silencer; Fig. 2'is acorresponding lateral elevation seen from the left; Fig. 3 is a detail;Figs. 4 and 5 are longitudmalsections of modifications of the device.

A simple exhaust tube pierced with holes or narrow openings for part ofits length only gives moderate results. The proportion of gas whichtraverses the openings is small and in practice it is necessary to haverecourse to one of the arrangements which I will now describe and whoseobject it is to increase this proportion.

In Figs. 1 and 2, the exhaust tube a, which is pierced with narrowopenings a1 for one part of its length, is contained within a tube cwhich is shorter than the tube a. The tubes a, 6,'0, are held at aconvenient distance from one another by the endvblocks d and also b theannular blocks e and f which act at t e same time as Stoppers., The tubeb is ierced with small holes b1. in the part whic lies between theblocks d and e` openin and with relatively larger holes bz in the partwhich lies between the blocks e and One art of the exhaust gases has itsexit direct y through the tube a, the other part traverses the openingsa1, then `the holes b1 and renters the tube b through th holes b2. Thegases which go out directly through the tube a produce on the gaseswhich go out from the tube c, that is to say, from the a1, a suctioneffect analogous to the act1on of an ejector, and they lncrease inconsequence the proportion of gases which traverse the openings al.V Theeiiicacy of the arrangement is. further increased by bending back thelip a2 of the openings a1 as shown in Fig. 3. Y

' Fig. 4 shows a modification in vwhich the tube b has been replaced bytwo transverse Stoppers la. perforated and placed in the tube c, w ichhas a coned outer end c1 over the outer end of the inner tube a, as inan ejector, so that the gases passing from the latter create adepression within the exterior tube c to draw the gasesthrough thelateral openings in the inner tube a, as indicated by the arrows.

vFi -5 illustrates another modification whic is at the Sametime of asimpler construction and permits of a better` drawing of the gasesthrough the tube 0. f In this case, the inner tube a has an' increasednumber of lateral openings a1 surrounded by an 'intermediate perforatedtube b. The forward end of the outer inclosing tube c i`s coned over theouter end of the inner tube, as in the construction Fig. 4.

I claim'as my invention:

1. A free and silent exhaust for explosive engines, comprising aninterior unobstruct-led tube open atits outer end and having throughouta greater partof its length lat-'- eral openings, an exterior concentrictube surrounding said interior tube and means whereby the gases passingout of the end of the interior tube create a depression within theexterior tube to draw the gases through the lateral openin in saidinteriory tube.

2. A free and si ent exhaust for explosive engines, comprising aninterior unobstructed tube open at itsl outer end, and having throughoutagreater pari-.fof its length latf l eral openings, an exteriorconcentric tube surrounding this interior tube, and an intermediateperforated tube, the interior and exterior tubes at their outer` endsconstituting an ejector to create a, depression within the exterior tubeto draw the gases through the 'openings in the interior and intermediatetubes. v

In testimony whereof4 I have signed my name to this specification, inthe presence of 10.

Witnesses:

LEON PEIILET, EUGENE Fmmi'r.

